Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

During an experiment, a guy throws a bouncy ball from a 100 feet tall building. The ball has a specific characteristic. Every time it hits the ground, it bounces up halfway.

How many bounces do you think the ball will make before it comes to a stop ?

What does the below mathematical rebus mean?

Count the number of times the letter "F" appears in the following paragraph:

FAY FRIED FIFTY POUNDS OF
SALTED FISH AND THREE POUNDS
OF DRY FENNEL FOR DINNER FOR
FORTY MEMBERS OF HER FATHER'S FAMILY.

Can anyone tell me a word in the English dictionary which has a silent 'z'?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

Imagine you are in a room with no windows or doors. How will you get out?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Name a key which is hardest to turn.

What am I?